Sigma phase evolution and nucleation mechanisms revealed by atom probe tomography in a 347H stainless steel

Ren, Qing-Qiang; Yamamoto, Yukinori; Brady, Michael P.; Poplawsky, Jonathan D.

doi:10.1016/j.mtla.2022.101485

Sigma phase evolution and nucleation mechanisms revealed by atom probe tomography in a 347H stainless steel

Journal Article · Mon Jun 20 00:00:00 EDT 2022 · Materialia

DOI:https://doi.org/10.1016/j.mtla.2022.101485· OSTI ID:1875352

^[1]; Yamamoto, Yukinori ^[1]; Brady, Michael P. ^[1]; Poplawsky, Jonathan D. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The size evolution and phase composition of sigma phases were investigated for a 347H stainless steel subject to isothermal aging at 750 °C for up to 10,000 h. Scanning electron microscopy reveals that sigma phases are present before 336 h aging and they continue to grow for all aging times studied. Atom probe tomography shows little variation in the sigma phase composition with aging time up to 10,000 h, and only the C content decreases with aging time. The comparison of C concentration suggests that the sigma phase does not nucleate within the C-depleted matrix or precipitate free grain boundaries, leaving dissolving metastable M₂₃C₆ as the only possible nucleation site. Based on the experimental results and thermodynamic simulations, the desirable Nb concentration is discussed to reduce the kinetics of sigma phase growth, and possible design directions are suggested to improve 347H.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1875352

Journal Information:: Materialia, Journal Name: Materialia Journal Issue: 1 Vol. 24; ISSN 2589-1529

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Aging
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Sigma phase evolution and nucleation mechanisms revealed by atom probe tomography in a 347H stainless steel

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